staging: vt6656: Remove preamble_type setting from vnt_tx_packet.

preamble_type is set in vnt_bss_info_changed no need to set it
here.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/04874ae5-0859-7cb5-619a-ac96a207be5d@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>